R Dataset / Package psych / cities

November 27, 2023

On this R-data statistics page, you will find information about the cities data set which pertains to Distances between 11 US cities. The cities data set is found in the psych R package. You can load the cities data set in R by issuing the following command at the console data("cities"). This will load the data into a variable called cities. If R says the cities data set is not found, you can try installing the package by issuing this command install.packages("psych") and then attempt to reload the data with the library() command. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the cities R data set. The size of this file is about 638 bytes.

Distances between 11 US cities

Description

Airline distances between 11 US cities may be used as an example for multidimensional scaling or cluster analysis.

Usage

data(cities)

Format

A data frame with 11 observations on the following 11 variables.

ATL: Atlana, Georgia
BOS: Boston, Massachusetts
ORD: Chicago, Illinois
DCA: Washington, District of Columbia
DEN: Denver, Colorado
LAX: Los Angeles, California
MIA: Miami, Florida
JFK: New York, New York
SEA: Seattle, Washington
SFO: San Francisco, California
MSY: New Orleans, Lousianna

Details

An 11 x11 matrix of distances between major US airports. This is a useful demonstration of multiple dimensional scaling.

city.location is a dataframe of longitude and latitude for those cities.

Note that the 2 dimensional MDS solution does not perfectly capture the data from these city distances. Boston, New York and Washington, D.C. are located slightly too far west, and Seattle and LA are slightly too far south.

Source

http://www.timeanddate.com/worldclock/distance.html

Examples

data(cities)
city.location[,1] <- -city.location[,1]
#not run
#an overlay map can be added if the package maps is available
#
#
#libary(maps)
#map("usa")
#title("MultiDimensional Scaling of US cities")
#points(city.location)plot(city.location, xlab="Dimension 1", ylab="Dimension 2",
 main ="Multidimensional scaling of US cities")
city.loc <- cmdscale(cities, k=2) #ask for a 2 dimensional solutionround(city.loc,0) 
city.loc <- -city.loc 
 city.loc <- rescale(city.loc,apply(city.location,2,mean),apply(city.location,2,sd))
points(city.loc,type="n") 
text(city.loc,labels=names(cities))

Dataset imported from https://www.r-project.org.

Attachments: csv, json

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